Cap-headed screw-nut



(No Model.) I

C. D. THATCHER.

CAP EEADED SCREW NUT. y

No. 322,867. Patented July 21, 1885.

UNITED STATES PATENT OFFICE.

CHARLES D. THATCHEE, OF SPRINGFIELD, OHIO.

CAP-HEADED SCREW-NUT.

SPECIFICATION forming part of Letters Patent No. 322,867, dated July 21, 188.5.

Application filed January 14, 1885. (No model.)

To all whom it may concern:

Beit known that I, CHARLEs D. TnA'rcnER, of Springfield, in the count-y of Clark'and State of Ohio, have invented new and useful Improvements in Cap-Headed Screw-Nuts, designed niore especially for use upon the topprops of carriages.

vIhis invention relates to an improvement in the headed nut for which Letters Patent No. 806,875 were issued to me October 2l, 1884; and it consists in the method of uniting the base of the head to the base of the nut without the intervention of a button with undercut groove and a spreader, as described insaid patent. In my said patent the nut is provided with a circular row of malleable prongs ranged on the base of the nut around the orice. These prongs are driven into and expanded in an undercut groove formed in the bottom of a former-button by means of a conical expander placed within the undercut groove, so that as the prongs are driven through the leather base into said groove they are expanded outward by and clinched Within said groove. The leather base of the head, having the necessary central hole for the passage of the screw, is placed over the base of the nut and button, and the head-cover piece then being placed over the face of the button is united to the base by stitches around the edges. This method requires the preparation of the button with the undercut groove and the conical expander, whereas my present improvement dispenses with the prepared button and expander, and

secures the nut directly to the leather base of the head, the cap -leather being secured to said base in the usual way, and the required external form or convexity of the cap-leather being secured by a filling of any proper material. This renders the device much cheaper and easy to make, without decreasing its efficiency in the least.

Ihat others may fully understand my imimprovement, I will particularly describe it, having reference to the accompanying drawings, wherein- Figure I is a perspective view of my capnut, partly in section to show the manner of attaching the base. Figs. 2 and 3 represent in central section modications of the structure of the base and shield.

A is the nut, provided, as usual, with the base-flange b. It is also provided with flexible claws d, cast integral with the nut. rIhe base E is commonly made of thick stiff leather, but it may be made of other suitable material. It may have a central hole large enough to slip over the claws d when they stand upright, and they are then beaten over, so as to clamp the base E down upon the face of the nut-ange b, as shown in the drawings, and thereby the nut and base E are iirmly united. The screw-shank upon which the nut A is screwed will sometimes be long enough to extend entirely through the nut, and in that event, if the leather-cap were not protected, the end of the screw would soon distigure and penetrate it. Io prevent this, a guard, G, is placed over the oriiice in the nut, and the cap H is then secured around the edges to the base E. Commonly the base E and cap H are made from leather, and-are united by stitching; but other materials, such as vulcanite, celluloid, paper, 8mo., and other modes of uniting, such as rivets, screws, &c., may be employed.

The guard G, I commonly make of sheetiron, saucer-shaped, as shown, and it then serves also as a former to give a desirable convexity to the exterior surface of the cap H. The form of the exterior surface is, however, an arbitrary matter, to which my invention is indifferent, the gist of it being in the means for and method ofdirectly uniting the nut A and base E by the claws d, as shown and described, in contradistinction to the other way set forth hereinbefore, wherein the nut is united to the former, which then serves to hold the base and cap in place on the nut.

Having described my invention, I claim- 1. A screw-threaded nut, A, provided with a ilange, b, and claws d, projecting therefrom parallel with the axis of the nut, combined with the base E, united to said nut directly by means of said claws in the manner substantially as set forth.

2. Ihe screw-threaded nut A, provided with the claws d, and the base F united to said nut, as set forth, combined with the cap H and the shield-former G, substantially as described.v

CHARLES D. 'IHATCHER Witnesses:

O. B. JonNsoN, W. F. OER. 

